Bib shorts represent the most personal piece of cycling kit you'll own, and the Mille GTO Summer Bib Shorts C2 from Assos reflect a decade of refinement in how they approach that contact point. The GTO designation signals their Gran Turismo Optimized philosophy—bibs engineered for long days in the saddle where comfort compounds over hours rather than minutes. These sit in the middle of the Assos hierarchy, below the flagship Equipe RS but incorporating trickle-down technology that would have been top-tier just a few seasons ago.
The construction centers on their Type.439 fabric, a lightweight compression textile that Assos developed specifically for warm-weather riding. It's noticeably thinner than their spring/fall options while maintaining the muscle support that helps manage fatigue on extended efforts. The fabric moves moisture efficiently, which matters when summer temperatures push your cooling system to its limits. Strategic raw-cut edges at the legs eliminate the bulk of traditional hems and reduce the pressure points that cause discomfort when you're three hours into a ride.
Assos uses their Equipe RS-level insert in these bibs, which is a meaningful upgrade from what you'd typically find at this price point. The chamois features their goldenGate construction—a suspended center section that moves independently from the edges, reducing friction and pressure as your body shifts through the pedal stroke. For riders who've experienced the creeping discomfort of a lesser pad on long rides, this design philosophy addresses the root cause rather than just adding more foam.... Read More
The bib straps themselves run through their stabilizerPockets system, which integrates lightweight mesh pockets into the front panel. These aren't storage pockets in the traditional sense—they're positioned to hold small items like gels against your torso without bouncing, keeping weight centered and stable. The mesh construction ensures the pockets don't create hot spots, and the integration means no additional seams or attachment points that could cause irritation.
Fit follows the Assos regularFit pattern, which accommodates a broader range of body types than their raceFit options while still providing genuine compression. The bibs run true to Assos sizing, so if you've worn their gear before, your usual size applies. The waistband sits lower than some competitors, which some riders prefer for comfort and others find takes adjustment. Worth noting: these are optimized for temperatures above 60°F—below that, you'll want their spring or winter options.
